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Nocte Lux 


hhiiilH ho/ 1 !/ tuMaal/ chare r\icf*f\\tat* 

build, hack, tweak, share, discover,- 

Nocte Lux 

Written By: Mahesh Venkitachalam 


Soldering/desoldering tools (1) 


555 timer SO-8 package (1) 
1206 SMD resistor 1K(1) 
1206 SMD resistor 1 0K (1) 
1206 SMD resistor 1M (1) 
1206 SMD resistor 470K(1) 
1206 SMD capacitor 0.01 uF (1) 
1206 or B SMD 100 uF capacitor (1) 
Tilt switch (1) 


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Nocte Lux 

For this project, I wanted to try and make a simple night lamp - something that you can put 
under your cot and use it simply by picking it up. Useful in case you get up in the middle of 
the night and need a quick light. So I used a tilt switch and a 555 IC to design the circuit. 

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Nocte Lux 

Step 1 — Nocte Lux 

, IF" 

, , Q &H 





• Download schematic and PCB design (EAGLE files) from here . 

• The tilt sensor I used is closed when upright. If you get one which is open when upright, 
no worries. Just mount it upside down, and you can use the same circuit. The important 
thing is that the switch should be closed in the default position of the lamp. You can read 
about tilt switches here . 

• You can read about the project in detail here . 
Step 2 

• You can make the PCB at home using the toner transfer process described here . 

• In this case, I greatly accelerated the process by sponging the PCB directly using ferric 
chloride. You can read about this technique here . 

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Nocte Lux 

Step 3 

• This project uses surface mount 
(SMD) components. If you haven't 
done an SMD circuit before, don't 
be intimidated by it. You don't need 
any fancy equipment to make an 
SMD circuit at home. 

• Here is a wonderful cartoon guide 
to SMD soldering. 

• As you can see from the photo, 
using SMD results in a very 
compact board compared to regular 
(through-hole) components. 

Step 4 

• I used a cheap translucent plastic container to house the circuit. 

• The LED strip can be hot glued onto the inside of the container in the shape of a helix. 

• The 9V battery holder is glued to the bottom of the container, and the PCB glued on to the 
side of it. Ensure that the title sensor is oriented so that the switch is closed in the default 

• Have fun making your night lamp! 

This document was last generated on 201 3-01 -27 03:20:1 9 AM. 

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